US20170244356A1 - Micro-Concentrator Module and Deployment Method - Google Patents
Micro-Concentrator Module and Deployment Method Download PDFInfo
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- US20170244356A1 US20170244356A1 US15/046,718 US201615046718A US2017244356A1 US 20170244356 A1 US20170244356 A1 US 20170244356A1 US 201615046718 A US201615046718 A US 201615046718A US 2017244356 A1 US2017244356 A1 US 2017244356A1
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S30/00—Structural details of PV modules other than those related to light conversion
- H02S30/20—Collapsible or foldable PV modules
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/20—Optical components
- H02S40/22—Light-reflecting or light-concentrating means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/054—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means
- H01L31/0547—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means comprising light concentrating means of the reflecting type, e.g. parabolic mirrors, concentrators using total internal reflection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S30/00—Structural details of PV modules other than those related to light conversion
- H02S30/10—Frame structures
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/52—PV systems with concentrators
Definitions
- the present disclosure generally relates to solar energy collectors, particularly those employing micro-concentrators, and deals more particularly with a micro-concentrator module that can be stowed and deployed on command.
- MEMS (micro-electromechanical systems) based micro-concentrator modules have been devised that increase solar energy conversion efficiency by employing MEMS controlled reflectors that track and concentrate solar radiation on an array of solar cells.
- These modules comprise a transparent cover glass spaced above an underlying substrate.
- An array of solar cells arranged on the underside of a cover glass are aligned with a corresponding array of MEMS based reflectors located on the substrate.
- the cover glass and underlying substrate are held in fixed, spaced-apart relationship to each other, either by mounting the cover glass and substrate in a rigid frame, or by connecting them with rigid spacers, such as screws located at the corners of the cover glass/substrate.
- the spacing between the cover glass and substrate is such that the solar cells are respectively positioned at the focal points of the MEMS-based reflectors.
- MEMS based concentrator modules described above while effective, have limitations when employed for certain applications, such as solar collectors used by spacecraft in deep space.
- the spacing required between solar cells and MEMS based reflectors result in a module that requires a relatively large volume of spacecraft during launch.
- known MEMS based concentrator model modules are relatively delicate and may be undesirably affected by compression and/or acoustic loads encountered during spacecraft launch.
- MEMS based concentrator modules that may be stowed to displace minimum volumes during launch of a spacecraft, but may be later deployed to operate normally while in deep space.
- a related method of stowing MEMS based concentrator modules during lunch, and subsequently deploying them while in space are also a need for a related method of stowing MEMS based concentrator modules during lunch, and subsequently deploying them while in space.
- a MEMS-based solar micro-concentrator module has a thin cover glass with miniature solar cells that hover above an array of MEMS based concentrators.
- the module In order to survive G-forces and compression/acoustic loads during spacecraft launch, the module is stowed in a collapsed condition. Following launch while in space, the module may be deployed to an expanded operating position, in which a cover glass containing solar cells is displaced away from an underlying substrate containing MEMS based reflectors that concentrate and reflect incident solar radiation onto the solar cells.
- Leaf springs bias the cover glass away from the underlying substrate during deployment and also act as an electrical connection between the solar cells and a circuit on a substrate that processes electrical power produced by the solar cells.
- Flexible, collapsible tethers connecting the cover glass with the substrate constrain the cover glass to limit its displacement away from substrate during deployment such that the solar cells are located and held at the focal length of the MEMS based reflectors.
- a micro-concentrator module comprising a cover glass and a plurality of solar cells located on one side of the cover glass.
- the cover glass is adapted to hover over a substrate that includes an array of micro-electromechanical systems (MEMS) based reflectors.
- MEMS micro-electromechanical systems
- the module also comprises a plurality of springs connecting the cover glass and the substrate, and a plurality of tethers connecting the cover glass with the substrate.
- a micro-concentrator solar array module comprising a substrate, an array of micro-electromechanical systems (MEMS) based reflectors on the substrate, and a cover glass.
- the module also includes a plurality of solar cells located on one side of the cover glass, and a plurality of springs biasing the cover glass to shift from a stowed position to a deployed position spaced above the MEMS based reflectors.
- MEMS micro-electromechanical systems
- a method is provided of deploying solar cells, comprising stowing a cover glass having solar cells thereon, and deploying the cover glass from a stowed position thereof closely overlying an array of micro-electromechanical systems (MEMS) based reflectors, to a deployed position in which the cover glass is spaced above the array of MEMS based reflectors at a focal length of the MEMS-based reflectors.
- MEMS micro-electromechanical systems
- FIG. 1 is an illustration of a perspective view of a micro-concentrator module, shown in a deployed condition.
- FIG. 2 is an illustration of an exploded, perspective view of the micro-concentrator module shown in FIG. 1 .
- FIG. 3 is an illustration of a fragmentary, perspective view of a portion of the bottom side of the cover glass forming part of the micro-concentrator module in FIGS. 1 and 2 , showing the solar cells.
- FIG. 4 is an illustration of a fragmentary, perspective view showing the configuration of the array of MEMS based concentrators on the substrate.
- FIG. 5 is an illustration of a diagram showing how the mirrors of one of the MEMS based micro-concentrators may be repositioned to maintain reflection of incident light at a focal point on a solar cell.
- FIG. 6 is an illustration of a plan view of the cover glass showing one subarray of solar cells and bus bars connected to the solar cells, the remaining arrays of solar cells not shown for clarity.
- FIG. 7 is an illustration of a cross-sectional view of the micro-concentrator module in its collapsed, stowed condition, taken along the line 7 - 7 in FIG. 6 .
- FIG. 8 is an illustration similar to FIG. 7 , but showing the micro-concentrator module in its expanded, deployed condition.
- FIG. 8A is an illustration area of the area designated as “ FIG. 8A ” in FIG. 8 .
- FIG. 9 is an illustration of a flow diagram of a method of deploying solar arrays.
- FIG. 10 is an illustration of a flow diagram of aircraft production and service methodology.
- FIG. 11 is an illustration of a block diagram of an aircraft.
- a deployable micro-concentrator solar module (MCM) 20 broadly comprises a substantially flat, transparent cover glass 22 , an array of solar cells 40 , an array 24 of MEMS based mirrors or reflectors and a substrate such as, without limitation, a printed wiring board (PWB) 26 .
- the array of MEMS based reflectors 24 is located on the top side of the PWB 26 .
- the bottom side of the PWB 26 contains electrical circuit traces 44 and electronic components, including an application specific integrated circuit (ASIC) 42 which controls the MCM module 20 , including the collection and processing of electrical power generated by the solar cells 40 .
- a damping pad 28 is mounted on and extends along the outer perimeter of the PWB 26 , surrounding the MEMS based reflectors 24 .
- a plurality of springs such as, without limitation, leaf springs 36 are connected between the bottom side of the cover glass 22 and the underlying printed wiring board 26 .
- leaf springs 36 are respectively located generally at the four corners of the MCM module 20 , however it may be possible in other examples to use as few as three or greater than four of the leaf springs 36 .
- the leaf springs may be formed of any suitable electrically conductive spring material, such as for example, beryllium copper (BeCu) spring wire.
- BeCu beryllium copper
- the cover glass 22 is spaced from and hovers above the PWB 26 , such that the solar cells 40 are respectively positioned at the focal length of the MEMS based reflector array 24 .
- the leaf springs 36 support the cover glass 22 on the PWB 26 .
- the MCM module 20 further comprises a plurality of flexible, collapsible tethers 38 between the PWB 26 and the cover glass 22 .
- a plurality of flexible, collapsible tethers 38 between the PWB 26 and the cover glass 22 .
- four of the tethers 38 are respectively located generally at the corners of the MCM module 20 adjacent the leaf springs 36 , however in other examples, as few as three or more than four of the tethers 38 may be employed, provided that they maintain the cover glass 22 in substantially parallel relationship to the MEMS based reflector array 24 after the deployment.
- Each of the tethers 38 has a length that is related to the focal length FL (see FIG. 8 ) of the MEMS based reflector array 24 .
- the tethers 38 function to restrain and thereby limit movement of the cover glass 22 during its deployment to a predetermined distance which is related to the focal length FL.
- the radiation reflected by the reflectors in the MEMS based reflector array 24 converges at, and is concentrated on the solar cells 40 , thereby maximizing the amount of incident radiation 52 ( FIG. 5 ) that is converted into electrical energy by the MCM module 20 .
- the tethers 38 may comprise, for example and without limitation, thin strips of flexible, collapsible film formed of a material suitable for the application.
- each of the tethers 38 has its opposite ends attached, as by adhesive bonding respectively to the PWB 26 and the bottom side 48 of the cover glass 22 .
- the tethers 38 may comprise, for example and without limitation, a polyimide film sold under the trademark black Kapton® or a multifilament yarn spun from a thermoplastic liquid crystal polymer sold under the trademark Vectran®.
- the damping pad 28 may be formed of a suitable foam or a similar shock absorbing, dampening material.
- the damping pad 28 may comprise a polyimide foam, such as one sold under the trademark Solimide®, or similar polyimide open cell foam, having a width and thickness suitable for the application.
- the damping pad 28 extends around the perimeter of the MCM module 20 , surrounding the MEMS based reflector array 24 .
- the damping pad 28 is discontinuous strip, having interruptions 45 within which the leaf springs 36 and tethers 38 are located.
- the damping pad 28 may be a continuous strip, in which case the leaf springs 36 and tethers 38 may be located in-board of the damping pad 28 .
- the damping pad 28 may comprise a plurality of individual pad-like cushions distributed around the perimeter of the PWB 26 , and aligned beneath the outer perimeter of the overlying cover glass 22 .
- the damping pad 28 In the stowed condition of the MCM module 20 , the damping pad 28 is sandwiched between the PWB 26 and the cover glass 22 , and functions to absorb acoustic and/or mechanical vibrations imposed on the MCM module 20 , as may occur during spacecraft launch.
- the damping pad 28 also supports the cover glass in spaced relationship above the array 24 of reflectors when the cover glass 22 is stowed.
- the solar cells 40 are located on the bottom side 48 ( FIG. 3 ) of the cover glass 22 , and in the illustrated example, are arranged in a grid of fifteen sub-arrays 35 (see FIG. 6 ), each containing thirty of the solar cells 40 . In other examples, more or fewer subarrays 35 and solar cells 40 may be employed.
- the solar cells 40 in each of the sub-arrays 35 are electrically coupled with each other by electrical circuit traces or interconnects 30 formed on the bottom side 48 of the cover glass 22 .
- each of the solar cells 40 may include a lens-like optical element 46 ( FIG. 3 ) that functions to concentrate incident solar radiation on the solar cells 40 .
- actuators 75 having plungers 75 a may engage the top side 50 of the cover glass to maintain the MCM module in its stowed condition until ready for deployment.
- the MEMS based reflector array 24 comprises a plurality of mirror-like reflectors 24 a that may be individually tilted and displaced as needed in order to reflect incident radiation 52 passing through the transparent cover glass 22 and focus the reflected radiation on a corresponding one of the corresponding solar cells 40 .
- the cover glass 22 a predetermined distance from the PWB 26 , the reflected radiation converges to a focal point corresponding to the location of the solar cell 40 , thereby maximizing the amount of radiation impinging upon the solar cell 40 .
- first and second bus bars 32 , 34 comprising electrical traces, are located on the bottom side 48 of the cover glass 22 .
- the bus bars 32 , 34 are coupled with the electrical interconnects 30 in each sub-array 35 of the solar cells 40 , and function to collect the electrical energy generated by the solar cells 40 .
- the electrical energy collected by the bus bars 32 , 34 are delivered through the electrically conductive leaf springs 36 to the PWB 26 for processing.
- the use of the leaf springs 36 as flexible electrical connections between the cover glass 22 and the PWB 26 eliminates the need for separate wire connections between the cover glass 22 and the PWB 26 .
- FIGS. 7 and 8 respectively show the MCM module 20 in its stowed and deployed conditions, wherein the MCM module 20 is mounted on an underlying panel 54 .
- the PWB 26 is electrically connected to electrical power and data traces (not shown) on top of the panel 54 by welds 56 .
- the cover glass 22 In its stowed position, the cover glass 22 is closely spaced from the PWB 26 , and the periphery of the cover glass 22 is held against the damping pad 28 .
- a later discussed force applicator 75 holds the cover glass 22 against movement to its deployed position by the leaf springs 36 .
- the leaf springs 36 Prior to deployment, the leaf springs 36 are compressed and the tethers 38 are collapsed.
- the damping pad 28 absorbs/damps shock and/or vibration, thereby preventing damage to the cover glass 22 , leaf springs 36 and other components of the MCM concentrator module 20 .
- each of the leaf springs 36 is connected as by a weld 55 to one of the bus bars 32 , 34 ( FIGS. 1-3 ).
- the opposite end 36 b of each of the leaf springs 36 is likewise connected by a weld 55 to circuit traces (not shown) on the PWB 26 .
- the opposite ends 36 a , 36 b may be mechanically and electrically connected to the bus bars 32 , 34 and the PWB 26 by soldering, riveting or other known techniques.
- the leaf springs 36 thus act as an electrical connection between the array of solar cells 40 on the cover glass 22 and electrical circuitry on the PWB 26 .
- the force applicator 75 may comprise, for example and without limitation, a suitable electrical, pneumatic, or hydraulic actuator (not shown).
- the force applicator 75 may comprise another overlying MCM module (not show) forming part of a solar panel array (not shown) that unfolds and moves away from the MCM module 20 when the solar panel array is deployed.
- the force applicator 75 is de-actuated, thereby removing the force that maintains the module 20 in its stowed condition.
- the cover glass 22 is precisely positioned relative to the PWB 26 , with solar cells 40 aligned above the MEMS based reflector array 24 at the focal length “FL” ( FIG. 8 ) of the MEMS based reflector array 24 .
- the leaf springs 36 function as electrical connections between the solar cells 40 and a PWB 26 as well as support the cover glass 22 on the PWB 26 .
- FIG. 9 broadly illustrates a method of deploying solar cells 40 .
- a cover glass 22 having solar cells 40 thereon is stowed.
- the cover glass 22 may be stowed in close proximity to an array 24 of underlying MEMS based reflectors.
- the cover glass 22 is deployed from its stowed position closely overlying an the array 24 of MEMS based reflectors, to a deployed position in which the solar cells 40 are spaced above the array at a focal length of the reflectors.
- Examples of the disclosure may find use in a variety of potential applications, particularly in the transportation industry, including for example, aerospace, marine, automotive applications and other application where solar collectors are mounted on vehicles, such as, without limitation, spacecraft.
- examples of the disclosure may be used in the context of a spacecraft manufacturing and service method 66 as shown in FIG. 10 and a spacecraft 68 shown in FIG. 11 .
- Spacecraft applications may include, for example, without limitation, MCM concentrator modules, comprising arrays of solar cells.
- exemplary method 66 may include specification and design 70 of the spacecraft 68 and material procurement 72 .
- component and subassembly manufacturing 74 and system integration 76 of the spacecraft 68 takes place.
- the spacecraft 68 may go through certification and delivery 78 in order to be placed in service 80 . While in service by a customer, the spacecraft 68 is scheduled for routine maintenance and service 82 , which may also include modification, reconfiguration, refurbishment, and so on.
- Each of the processes of method 66 may be performed or carried out by a system integrator, a third party, and/or an operator (e.g., a customer).
- a system integrator may include without limitation any number of spacecraft manufacturers or major-system subcontractors
- a third party may include without limitation any number of vendors, subcontractors, or suppliers
- an operator may be an airline, leasing company, military entity, service organization, and so on.
- the spacecraft 68 produced by exemplary method 118 may include an airframe 84 with a plurality of systems 86 and an interior 88 .
- high-level systems 86 include one or more of a propulsion system 90 , an electrical system 92 , a hydraulic system 94 and an environmental system 96 . Any number of other systems may be included.
- an aerospace example is shown, the principles of the disclosure may be applied to other industries, such as the marine and automotive industries.
- Systems and methods embodied herein may be employed during any one or more of the stages of the production and service method 66 .
- components or subassemblies corresponding to production process 74 may be fabricated or manufactured in a manner similar to components or subassemblies produced while the spacecraft 68 is in service.
- one or more apparatus examples, method examples, or a combination thereof may be utilized during the production stages 74 and 76 , for example, by substantially expediting assembly of or reducing the cost of a spacecraft.
- one or more of apparatus examples, method embodiments, or a combination thereof may be utilized while the spacecraft 68 is in service, for example and without limitation, to maintenance or service 82 .
- the phrase “at least one of”, when used with a list of items, means different combinations of one or more of the listed items may be used and only one of each item in the list may be needed.
- “at least one of item A, item B, and item C” may include, without limitation, item A, item A and item B, or item B. This example also may include item A, item B, and item C or item B and item C.
- the item may be a particular object, thing, or a category. In other words, at least one of means any combination items and number of items may be used from the list but not all of the items in the list are required.
Abstract
Description
- 1. Field
- The present disclosure generally relates to solar energy collectors, particularly those employing micro-concentrators, and deals more particularly with a micro-concentrator module that can be stowed and deployed on command.
- 2. Background
- MEMS (micro-electromechanical systems) based micro-concentrator modules have been devised that increase solar energy conversion efficiency by employing MEMS controlled reflectors that track and concentrate solar radiation on an array of solar cells. These modules comprise a transparent cover glass spaced above an underlying substrate. An array of solar cells arranged on the underside of a cover glass are aligned with a corresponding array of MEMS based reflectors located on the substrate. The cover glass and underlying substrate are held in fixed, spaced-apart relationship to each other, either by mounting the cover glass and substrate in a rigid frame, or by connecting them with rigid spacers, such as screws located at the corners of the cover glass/substrate. The spacing between the cover glass and substrate is such that the solar cells are respectively positioned at the focal points of the MEMS-based reflectors.
- The MEMS based concentrator modules described above, while effective, have limitations when employed for certain applications, such as solar collectors used by spacecraft in deep space. In spacecraft applications, the spacing required between solar cells and MEMS based reflectors result in a module that requires a relatively large volume of spacecraft during launch. Moreover, known MEMS based concentrator model modules are relatively delicate and may be undesirably affected by compression and/or acoustic loads encountered during spacecraft launch.
- Accordingly, there is a need for MEMS based concentrator modules that may be stowed to displace minimum volumes during launch of a spacecraft, but may be later deployed to operate normally while in deep space. There is also a need for a related method of stowing MEMS based concentrator modules during lunch, and subsequently deploying them while in space.
- A MEMS-based solar micro-concentrator module has a thin cover glass with miniature solar cells that hover above an array of MEMS based concentrators. In order to survive G-forces and compression/acoustic loads during spacecraft launch, the module is stowed in a collapsed condition. Following launch while in space, the module may be deployed to an expanded operating position, in which a cover glass containing solar cells is displaced away from an underlying substrate containing MEMS based reflectors that concentrate and reflect incident solar radiation onto the solar cells. Leaf springs bias the cover glass away from the underlying substrate during deployment and also act as an electrical connection between the solar cells and a circuit on a substrate that processes electrical power produced by the solar cells. Flexible, collapsible tethers connecting the cover glass with the substrate constrain the cover glass to limit its displacement away from substrate during deployment such that the solar cells are located and held at the focal length of the MEMS based reflectors.
- According to one disclosed example, a micro-concentrator module is provided, comprising a cover glass and a plurality of solar cells located on one side of the cover glass. The cover glass is adapted to hover over a substrate that includes an array of micro-electromechanical systems (MEMS) based reflectors. The module also comprises a plurality of springs connecting the cover glass and the substrate, and a plurality of tethers connecting the cover glass with the substrate.
- According to another disclosed example, a micro-concentrator solar array module is provided comprising a substrate, an array of micro-electromechanical systems (MEMS) based reflectors on the substrate, and a cover glass. The module also includes a plurality of solar cells located on one side of the cover glass, and a plurality of springs biasing the cover glass to shift from a stowed position to a deployed position spaced above the MEMS based reflectors.
- According to still another example, a method is provided of deploying solar cells, comprising stowing a cover glass having solar cells thereon, and deploying the cover glass from a stowed position thereof closely overlying an array of micro-electromechanical systems (MEMS) based reflectors, to a deployed position in which the cover glass is spaced above the array of MEMS based reflectors at a focal length of the MEMS-based reflectors.
- The features, functions, and advantages can be achieved independently in various examples of the present disclosure or may be combined in yet other examples in which further details can be seen with reference to the following description and drawings.
- The novel features believed characteristic of the illustrative examples are set forth in the appended claims. The illustrative examples, however, as well as a preferred mode of use, further objectives and advantages thereof, will best be understood by reference to the following detailed description of an illustrative example of the present disclosure when read in conjunction with the accompanying drawings, wherein:
-
FIG. 1 is an illustration of a perspective view of a micro-concentrator module, shown in a deployed condition. -
FIG. 2 is an illustration of an exploded, perspective view of the micro-concentrator module shown inFIG. 1 . -
FIG. 3 is an illustration of a fragmentary, perspective view of a portion of the bottom side of the cover glass forming part of the micro-concentrator module inFIGS. 1 and 2 , showing the solar cells. -
FIG. 4 is an illustration of a fragmentary, perspective view showing the configuration of the array of MEMS based concentrators on the substrate. -
FIG. 5 is an illustration of a diagram showing how the mirrors of one of the MEMS based micro-concentrators may be repositioned to maintain reflection of incident light at a focal point on a solar cell. -
FIG. 6 is an illustration of a plan view of the cover glass showing one subarray of solar cells and bus bars connected to the solar cells, the remaining arrays of solar cells not shown for clarity. -
FIG. 7 is an illustration of a cross-sectional view of the micro-concentrator module in its collapsed, stowed condition, taken along the line 7-7 inFIG. 6 . -
FIG. 8 is an illustration similar toFIG. 7 , but showing the micro-concentrator module in its expanded, deployed condition. -
FIG. 8A is an illustration area of the area designated as “FIG. 8A ” inFIG. 8 . -
FIG. 9 is an illustration of a flow diagram of a method of deploying solar arrays. -
FIG. 10 is an illustration of a flow diagram of aircraft production and service methodology. -
FIG. 11 is an illustration of a block diagram of an aircraft. - Referring first to
FIGS. 1 and 2 , a deployable micro-concentrator solar module (MCM) 20 broadly comprises a substantially flat,transparent cover glass 22, an array ofsolar cells 40, anarray 24 of MEMS based mirrors or reflectors and a substrate such as, without limitation, a printed wiring board (PWB) 26. The array of MEMS basedreflectors 24 is located on the top side of thePWB 26. The bottom side of thePWB 26 containselectrical circuit traces 44 and electronic components, including an application specific integrated circuit (ASIC) 42 which controls theMCM module 20, including the collection and processing of electrical power generated by thesolar cells 40. Adamping pad 28 is mounted on and extends along the outer perimeter of the PWB 26, surrounding the MEMS basedreflectors 24. - A plurality of springs, such as, without limitation,
leaf springs 36 are connected between the bottom side of thecover glass 22 and the underlying printedwiring board 26. In the illustrated example, four of theleaf springs 36 are respectively located generally at the four corners of theMCM module 20, however it may be possible in other examples to use as few as three or greater than four of theleaf springs 36. The leaf springs may be formed of any suitable electrically conductive spring material, such as for example, beryllium copper (BeCu) spring wire. As will be discussed later in more detail, theleaf springs 36 bias thecover glass 22 to move away from thePWB 26 from a stowed position, to a deployed position (FIG. 1 ) in which thecover glass 22 is spaced from and hovers above thePWB 26, such that thesolar cells 40 are respectively positioned at the focal length of the MEMS basedreflector array 24. Once deployed, theleaf springs 36 support thecover glass 22 on the PWB 26. - The
MCM module 20 further comprises a plurality of flexible,collapsible tethers 38 between thePWB 26 and thecover glass 22. In the illustrated example, four of thetethers 38 are respectively located generally at the corners of theMCM module 20 adjacent theleaf springs 36, however in other examples, as few as three or more than four of thetethers 38 may be employed, provided that they maintain thecover glass 22 in substantially parallel relationship to the MEMS basedreflector array 24 after the deployment. Each of thetethers 38 has a length that is related to the focal length FL (seeFIG. 8 ) of the MEMS basedreflector array 24. Thetethers 38 function to restrain and thereby limit movement of thecover glass 22 during its deployment to a predetermined distance which is related to the focal length FL. By deploying thecover glass 22 at this predetermined distance from thePWB 26, the radiation reflected by the reflectors in the MEMS basedreflector array 24 converges at, and is concentrated on thesolar cells 40, thereby maximizing the amount of incident radiation 52 (FIG. 5 ) that is converted into electrical energy by theMCM module 20. Thetethers 38 may comprise, for example and without limitation, thin strips of flexible, collapsible film formed of a material suitable for the application. Each of thetethers 38 has its opposite ends attached, as by adhesive bonding respectively to thePWB 26 and thebottom side 48 of thecover glass 22. In one example suitable for deep space environments, thetethers 38 may comprise, for example and without limitation, a polyimide film sold under the trademark black Kapton® or a multifilament yarn spun from a thermoplastic liquid crystal polymer sold under the trademark Vectran®. - The
damping pad 28 may be formed of a suitable foam or a similar shock absorbing, dampening material. For example and without limitation, the dampingpad 28 may comprise a polyimide foam, such as one sold under the trademark Solimide®, or similar polyimide open cell foam, having a width and thickness suitable for the application. The dampingpad 28 extends around the perimeter of theMCM module 20, surrounding the MEMS basedreflector array 24. In the illustrated example, the dampingpad 28 is discontinuous strip, havinginterruptions 45 within which theleaf springs 36 and tethers 38 are located. However, in other examples, the dampingpad 28 may be a continuous strip, in which case theleaf springs 36 and tethers 38 may be located in-board of the dampingpad 28. In still other examples, the dampingpad 28 may comprise a plurality of individual pad-like cushions distributed around the perimeter of thePWB 26, and aligned beneath the outer perimeter of theoverlying cover glass 22. In the stowed condition of theMCM module 20, the dampingpad 28 is sandwiched between thePWB 26 and thecover glass 22, and functions to absorb acoustic and/or mechanical vibrations imposed on theMCM module 20, as may occur during spacecraft launch. The dampingpad 28 also supports the cover glass in spaced relationship above thearray 24 of reflectors when thecover glass 22 is stowed. - Referring now to
FIGS. 1-3 and 6 , thesolar cells 40 are located on the bottom side 48 (FIG. 3 ) of thecover glass 22, and in the illustrated example, are arranged in a grid of fifteen sub-arrays 35 (seeFIG. 6 ), each containing thirty of thesolar cells 40. In other examples, more or fewer subarrays 35 andsolar cells 40 may be employed. Thesolar cells 40 in each of the sub-arrays 35 are electrically coupled with each other by electrical circuit traces or interconnects 30 formed on thebottom side 48 of thecover glass 22. In some examples, each of thesolar cells 40 may include a lens-like optical element 46 (FIG. 3 ) that functions to concentrate incident solar radiation on thesolar cells 40. As will be discussed below in connection withFIGS. 7 and 8 ,actuators 75 having plungers 75 a may engage the top side 50 of the cover glass to maintain the MCM module in its stowed condition until ready for deployment. - Referring to
FIGS. 4 and 5 , the MEMS basedreflector array 24 comprises a plurality of mirror-like reflectors 24 a that may be individually tilted and displaced as needed in order to reflectincident radiation 52 passing through thetransparent cover glass 22 and focus the reflected radiation on a corresponding one of the correspondingsolar cells 40. As previously discussed, by positioning the cover glass 22 a predetermined distance from thePWB 26, the reflected radiation converges to a focal point corresponding to the location of thesolar cell 40, thereby maximizing the amount of radiation impinging upon thesolar cell 40. - As shown in
FIGS. 1, 2 and 6 , first and second bus bars 32, 34 comprising electrical traces, are located on thebottom side 48 of thecover glass 22. The bus bars 32, 34 are coupled with theelectrical interconnects 30 in each sub-array 35 of thesolar cells 40, and function to collect the electrical energy generated by thesolar cells 40. As will be discussed below, the electrical energy collected by the bus bars 32, 34 are delivered through the electricallyconductive leaf springs 36 to thePWB 26 for processing. The use of theleaf springs 36 as flexible electrical connections between thecover glass 22 and thePWB 26 eliminates the need for separate wire connections between thecover glass 22 and thePWB 26. - Attention is now directed to
FIGS. 7 and 8 which respectively show theMCM module 20 in its stowed and deployed conditions, wherein theMCM module 20 is mounted on anunderlying panel 54. ThePWB 26 is electrically connected to electrical power and data traces (not shown) on top of thepanel 54 bywelds 56. In its stowed position, thecover glass 22 is closely spaced from thePWB 26, and the periphery of thecover glass 22 is held against the dampingpad 28. A later discussedforce applicator 75 holds thecover glass 22 against movement to its deployed position by the leaf springs 36. As can be seen inFIG. 7 , prior to deployment, theleaf springs 36 are compressed and thetethers 38 are collapsed. During spacecraft launch or vehicle transport, the dampingpad 28 absorbs/damps shock and/or vibration, thereby preventing damage to thecover glass 22,leaf springs 36 and other components of theMCM concentrator module 20. - Referring now particularly to
FIGS. 8 and 8A , theupper end 36 a of each of the leaf springs 36 is connected as by aweld 55 to one of the bus bars 32, 34 (FIGS. 1-3 ). Theopposite end 36 b of each of the leaf springs 36 is likewise connected by aweld 55 to circuit traces (not shown) on thePWB 26. Alternatively, the opposite ends 36 a, 36 b may be mechanically and electrically connected to the bus bars 32, 34 and thePWB 26 by soldering, riveting or other known techniques. The leaf springs 36 thus act as an electrical connection between the array ofsolar cells 40 on thecover glass 22 and electrical circuitry on thePWB 26. - In use, prior to vehicle launch or transport, the
cover glass 22 is pushed down toward thePWB 26 either manually or by anautomated force applicator 75. Theforce applicator 75 may comprise, for example and without limitation, a suitable electrical, pneumatic, or hydraulic actuator (not shown). Alternatively, theforce applicator 75 may comprise another overlying MCM module (not show) forming part of a solar panel array (not shown) that unfolds and moves away from theMCM module 20 when the solar panel array is deployed. When theMCM concentrator module 20 is ready for use (deployment), theforce applicator 75 is de-actuated, thereby removing the force that maintains themodule 20 in its stowed condition. In the solar panel array example described above, unfolding of the solar panels releases thecover glass 22, allowing it to move away from the underlyingPWB 26. With theforce applicator 75 de-actuated, the biasing influence of theleaf springs 36 causes displacement of thecover glass 22 upwardly away from thePWB 26. As thecover glass 22 moves upwardly, thetethers 38 unfold and extend. When thetethers 38 are fully extended and tensioned as a result of the force applied to thecover glass 22 by theleaf springs 36, thetethers 38 to restrain thecover glass 22 against further movement. It should be noted here that during the deployment, thecover glass 22 translates in a slight arc as it moves away from thePWB 26 to its deployed position. However, once deployed, thecover glass 22 is precisely positioned relative to thePWB 26, withsolar cells 40 aligned above the MEMS basedreflector array 24 at the focal length “FL” (FIG. 8 ) of the MEMS basedreflector array 24. After deployment, theleaf springs 36 function as electrical connections between thesolar cells 40 and aPWB 26 as well as support thecover glass 22 on thePWB 26. -
FIG. 9 broadly illustrates a method of deployingsolar cells 40. At 62, acover glass 22 havingsolar cells 40 thereon is stowed. For example, thecover glass 22 may be stowed in close proximity to anarray 24 of underlying MEMS based reflectors. At 64, thecover glass 22 is deployed from its stowed position closely overlying an thearray 24 of MEMS based reflectors, to a deployed position in which thesolar cells 40 are spaced above the array at a focal length of the reflectors. - Examples of the disclosure may find use in a variety of potential applications, particularly in the transportation industry, including for example, aerospace, marine, automotive applications and other application where solar collectors are mounted on vehicles, such as, without limitation, spacecraft. Thus, referring now to
FIGS. 10 and 11 , examples of the disclosure may be used in the context of a spacecraft manufacturing andservice method 66 as shown inFIG. 10 and aspacecraft 68 shown inFIG. 11 . Spacecraft applications may include, for example, without limitation, MCM concentrator modules, comprising arrays of solar cells. During pre-production,exemplary method 66 may include specification anddesign 70 of thespacecraft 68 andmaterial procurement 72. During production, component andsubassembly manufacturing 74 andsystem integration 76 of thespacecraft 68 takes place. Thereafter, thespacecraft 68 may go through certification anddelivery 78 in order to be placed inservice 80. While in service by a customer, thespacecraft 68 is scheduled for routine maintenance andservice 82, which may also include modification, reconfiguration, refurbishment, and so on. - Each of the processes of
method 66 may be performed or carried out by a system integrator, a third party, and/or an operator (e.g., a customer). For the purposes of this description, a system integrator may include without limitation any number of spacecraft manufacturers or major-system subcontractors; a third party may include without limitation any number of vendors, subcontractors, or suppliers; and an operator may be an airline, leasing company, military entity, service organization, and so on. - As shown in
FIG. 11 , thespacecraft 68 produced by exemplary method 118 may include anairframe 84 with a plurality ofsystems 86 and an interior 88. Examples of high-level systems 86 include one or more of apropulsion system 90, anelectrical system 92, ahydraulic system 94 and anenvironmental system 96. Any number of other systems may be included. Although an aerospace example is shown, the principles of the disclosure may be applied to other industries, such as the marine and automotive industries. - Systems and methods embodied herein may be employed during any one or more of the stages of the production and
service method 66. For example, components or subassemblies corresponding toproduction process 74 may be fabricated or manufactured in a manner similar to components or subassemblies produced while thespacecraft 68 is in service. Also, one or more apparatus examples, method examples, or a combination thereof may be utilized during the production stages 74 and 76, for example, by substantially expediting assembly of or reducing the cost of a spacecraft. Similarly, one or more of apparatus examples, method embodiments, or a combination thereof may be utilized while thespacecraft 68 is in service, for example and without limitation, to maintenance orservice 82. - As used herein, the phrase “at least one of”, when used with a list of items, means different combinations of one or more of the listed items may be used and only one of each item in the list may be needed. For example, “at least one of item A, item B, and item C” may include, without limitation, item A, item A and item B, or item B. This example also may include item A, item B, and item C or item B and item C. The item may be a particular object, thing, or a category. In other words, at least one of means any combination items and number of items may be used from the list but not all of the items in the list are required.
- The description of the different illustrative examples has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the examples in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. Further, different illustrative examples may provide different advantages as compared to other illustrative examples. The example or examples selected are chosen and described in order to best explain the principles, the practical application, and to enable others of ordinary skill in the art to understand the disclosure for various examples with various modifications as are suited to the particular use contemplated.
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US10367449B2 (en) | 2019-07-30 |
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